Supernova 2011jj in Pgc 5364 = Psn J01263180+3137026
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2011
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Abstract
Report the discovery of an apparent supernova in public images from the Catalina Sky Survey (CSS): SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011jj Dec. 1.09 1 26 31.80 +31 37 02.6 19.8 23".0 W, 3".8 N Note that the position is close to SN 2011ix (cf. CBET 2942), which is also seen in some of the follow-up CSS images. The variable was designated PSN J01263180+3137026 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2011jj based on the spectroscopic confirmation reported below. Additional magnitudes for 2011jj (unfiltered unless noted otherwise): Sept. 22.24 UT, [20.2 (CSS); Oct. 16.183, 19.1 (Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K camera + luminance filter at the New Mexico Skies Observatory near Mayhill, NM, U.S.A.; position end figures 31s.76, 02".8); 18.22, 19.3 (CSS); 24.33, 19.5 (CSS); Nov. 1.25, 19.3 (CSS); 1.403, 19.4 (Brimacombe; position end figures 31s.82, 02".8); Dec. 18.213, 19.5 (Brimacombe; position end figures 31s.80, 03".0). Brimacombe's Oct. 16 image is posted at the following website URL: http://www.flickr.com/photos/43846774@N02/6536985993/; his Nov. 1 image is posted at http://www.flickr.com/photos/43846774@N02/6539516343/; and his Dec. 18 image is posted at http://www.flickr.com/photos/43846774@N02/6536691675/. L. Tomasella, S. Valenti, S. Benetti, F. Bufano, M. Fiaschi, A. Pastorello, and P. Ochner, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica, on behalf of a larger collaboration, report that a spectrogram of PSN J01263180+3137026 = SN 2011jj, obtained on Dec. 23.77 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC; range 350-820 nm; resolution 2.4nm), suggests that it is a type-IIP supernova around 50 days after explosion. Cross-correlation with a library of supernova spectra via the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2011jj is similar to SN 2004et (Maguire et al. 2010, MNRAS 404, 981)....